package com.itheima.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

@WebFilter(value = {"/findStudent","/addStudent","/addStudent.jsp","/find.jsp"})
public class LoginFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        String username = req.getParameter("username");
        if (username == null || "".equals(username)){
            response.sendRedirect(request.getContextPath()+"/login.jsp");
            return;
        }
        chain.doFilter(req, resp);
    }

    public void init(FilterConfig config) throws ServletException {

    }

    public void destroy() {
    }
}
